Arc-lamp.



c. A. B. HALvonsoN. in.

AHC LAMP.

APPLICATION min Aue.31. 1915.

PatentedAug. 14, 1917.

i Fig.

` Inventor Cromwel A B. Hah/o1` sn Jr., by QM j ,Mm

Hisl .7Tttorneg- UNITED STATES PATENT oEErCE.

GROMWELL A.

E. HALvoRsoN, JE., 0E LYNN, MASSACHUSETTS, ASSIGNCE To GENERAL y ELECTRIC COMPANY, Af CoRPoRATroN or NEW YCEKJ.

AEC-LAMP. I

To all whom t may concern.'

Be it known that I, GRoMwELL A. B. I-IAL- voRsoN, J r., a citizen of thel United States, residing at Lynn, in the county `of Essex and State of Massachusetts, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification. f

My invention has reference to an arc lamp in which one of the electrodes, usually the anode, is formed of a piece of very slowly consuming material, such as metal, and which is known in the art as a non-consuming electrode, although it is well known that electrodes of this character are as a matter of fac-t gradually consumed. Such electrodes haveV hitherto been 'commonly formed of a b ar of copper which, as stated, is slowly consumed and as this bar is stationary with reference to the frame of the lamp, the position of the arc is changed..`

It is sometimes desirable, however, and particularly where the arc` is surrounded by a refracting globe which directs the rays of light to the region where they will bemost useful that the arc should be maintained at the same point in the lamp; in other words, that the lamps should be focusing. My invention has as one of its objects the provision of'an electrode of this character which may be readily adjusted and secured in position so as to make the lamp Substantially focusing.

The cathode which coperates with the anode as just described is formed of a ma terial, such as the well known magnetite mixture, which during burning evolves vapors which pass into the arc and impart luminosity to the same. The nature of this material is also such that during operation a molten pool is commonly formed on the arcing face and when, as a result of a feeding operation, the cathode is forcibly impacted against the anode, it is likely to be welded or frozen to the anode. My invention has as a further object the provision of a Structure combined with an anode of the character above described which prevents the welding of the two electrodes together. Preferably this is accomplished by angularly displacing the cathode with reference to the anode when the same is brought into engagement therewith. I do not, in the present application, broadly claim means for causing one of the elec- Patented Aug. 14, 1917.

trodes to be angularly displaced with reference to the other when they yare brought into engagement, as this is shown in Patent No. 97 3,653 which was vissued to me onOctober 25, 1910. But my present invention provides a holder for the electrode', means for adjusting the normal angular position 'and the degree of angular displacement of the electrode necessary to prevent freezing under various conditions of climate and ofcomposition of the electrode; also a means for clamping and unclamping the electrode thereby permitting its longitudinal adjustment to compensate for consumption, and also permitting the electrode `to be turned about its axis, to rectify the unavoidable side burning of the same.

For a fuller understanding of my invention, reference may'behad to the accompanying drawing in which Figure 1 is a vertical section of the fume-box .on which the anode is mounted, but showing the electrodes and the support for the anode in elevation; Fig. 2 is a cross-section'on the line 2 2 of Fig. 1; Fig. 3 is a view 'similar to Fig. 1, Showing a modilication of my in- "'vention; and Fig. 4 is a cross section on the line 4 4 of Fig. 3.

Referring 'now to the drawing, 10 and 11 are the upper non-consuming `anode and the lower consuming cathode, respectively. In the preferred form of my invention, the upper end of the anode 10 is screw-threaded and is received within a threaded opening in a nut 12, which is secured to and may be integral with a stem 13.

The stem passes through an opening in a supporting arm -14 which constitutes the electrode support or holder and which is pivoted at 15 to a downwardly extending bracket 16 formed on a stationary member 17. An arm 18 which is pivoted at 19 to the support 14 also embraces the stem 13. The free end 21 of the arm 18 is engaged by the upper end of a screw 20 which passes through a tapped opening in the supporting arm 14. When the arm 18 is released, the anode is freely movable longitudinally through the arms 14 and 18 and may be turned about its axis, and it may be secured in any position to which it is adjusted by lifting the free end of the arm 18 by means of the screw 20. Two stops are carried by the support 14, one on either side of the pivot 15, and so' arranged as to permit the supporting arm 14 a limited oscillating movement. Preferably, these stops consist of two screws 22 and 23, the screw 22 engaging a lug 24 on the member 17 while the screw 23 directly engages this member so that the normal angular position of the electrode l0 may be adjusted by moving the screw 23, and the degree of its free angular movement may be determined by moving the screw 22. The plate or member 17 is secured against the bottom of a sleeve 25, and a projection or lug 26 (see Fig. 2) formed integral with the fume-box 27, suitable insulation 28 being interposed between the plate 17 and the members 25 and 26. A binding post 29 passes through the sleeve 25, and a flexible conductor 30 connects the plate or member 17 to the supporting arm 14 for the anode.

I have not illustrated in the drawings the feeding mechanism for the lamp, since these parts are well known in the art and are shown in the patent issued to me above referred to, to which reference may be had for the details of a feeding mechanism suitable for va lamp embodying my invention.

Vhen a feeding operation takes place, the lower electrode is forcibly brought into engagement with the Lipper electrode, and

since the stops 22 and 23 are so arranged as to permit a limited swing of the arm 14, the upper electrode 10 is angularly displaced with reference to the lower electrode, and this effectually prevents the formation of any weld.

In Figs. 3 and 4 I have shown a modication of a part of my invention, which may vbe installed in arc lamps such as shown in the patent above referred to, and which are already extensively in use. In lamps of this character the upper electrode is supported by radiating'v wings 3l, which are received in slots formed at either side of the fumebox 26a. One end of the radiating wings is pivoted at 32, while the other end is provided with an opening 33k "substantially ,larger than the pin 34 which passes through the opening 33 and is received in flanges formed on the fume-box. The arm 1S is pivoted to the radiating wings in a manner similar to that shown in Fig. 1, and is caused to rotate about its pivot by means of a screw 20.

In accordance with the provisions of the patent statutes, I have described., the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; butr I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

llVhat I claim as new and desire to secure by Letters Patent of the United States, is :H

In an arc lamp, .a non-consuming electrode; a pivoted holder for the same; means for adjusting thel normal angular position of the holder and electrode; means for` adjusting the degree of free swing of the holder about its pivot, and means for clamping the electrode to and unclamping it from its holder, thereby permitting the electrode to be adjusted axially and to be turned about its axis.

In witness whereof, I hereunto set my hand this 28th day of August 1915.

CROMWELL A. B. HALVORSON, JR,

Copies of this patent may be obtained for ve cents each, by addressing th'e Commissioner of latents, Washington, D. G. 

